Add inline hints to improve code-size.

Codegen:

diff --git a/tmp/old-19d4fc84639c079fe0c820099ddeefadbf9bafc0 b/tmp/new-cecfd35b04a77afdd993a58ac5a3566cc0f1ee80
index 1fa1fbf..5e2ac96 100644
--- a/tmp/old-19d4fc84639c079fe0c820099ddeefadbf9bafc0
+++ b/tmp/new-cecfd35b04a77afdd993a58ac5a3566cc0f1ee80
@@ -5,10 +5,10 @@ target/riscv32imc-unknown-none-elf/debug/deps/sha384acc-fe407b26dcfe0bd6
   [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
   [ 1] .text             PROGBITS        00000000 001000 002107 00 AXM  0   0 16
    00     .text
 target/riscv32imc-unknown-none-elf/debug/deps/keyvault-4fb0b48ede24b5d3
-  [ 1] .text             PROGBITS        00000000 001000 000611 00 AXM  0   0  4
+  [ 1] .text             PROGBITS        00000000 001000 000535 00 AXM  0   0  4
    00     .text
 target/riscv32imc-unknown-none-elf/debug/deps/pcrbank-1137173429479419
-  [ 1] .text             PROGBITS        00000000 001000 000ac2 00  AX  0   0  2
+  [ 1] .text             PROGBITS        00000000 001000 000a2c 00  AX  0   0  2
    00     .text
 target/riscv32imc-unknown-none-elf/debug/deps/error_reporter-bb9853b7c1d20f6b
   [ 1] .text             PROGBITS        00000000 001000 0001ec 00  AX  0   0  2